4.2 is considered older in the summary. According to Wikipedia: "4.2 (Powell) 23 April 2015". I doubt many people update each and every time.
By the way, I just don't get:
mysql> GRANT ALL PRIVILEGES ON databasename.* TO "wordpressusername"@"hostname" IDENTIFIED BY "password";
WordPress is not the only software to do this. And MySQL does support multiple users, each with different rights. I don't get it why a visitor of a website accesses indirectly the database with rights to drop all tables, modify all tables
I have no idea what you want to do with 2+ USB ports. If I was to buy a MacBook I probably would also buy a "Belkin Thunderbolt 2 Express HD Dock" or "Elgato Thunderbolt 2 Dock" or similar because when I need more than one USB port I am most likely at my desk juggling with several USB devices. Those devices are not cheap, but provide a lot of connectivity options.
And if I was travelling with more than 2 USB devices I most likely have space for something like Anker's "USB 3.0 7-Port Portable Aluminum Hub" or similar.
I am afraid that needing more than one (or two) USB ports is in itself a niche. Not here, on Slashdot, but in general. And I think that's often overlooked at this site, that the "techies" are not the majority but people like my mom are.
Nothing is finished until the paperwork is done.